Improve error management (#160)

Closes #71

lib/views/error.js

@@ -52,10 +52,24 @@ ${stack}
 \`\`\`` : "";
 }
 
+    fileIssue(err, pr) {
+        let service = err.data && err.data.service;
+        if (service) {
+            let name = service.name;
+            let link = `[${name}](${service.url})`;
+            return ```_This seems to be an issue with the ${ link } service. PR Preview doesn't manage this service and so has no control over it. If you've identified an issue with it, you can [report the issue to the maintainers of ${ name }](${ service.reportIssue }) directly. Please be courteous. Thank you!_
+            
+_If you don't have enough information above to solve the error by yourself or if the issue doesn't seem related to ${ name }, you can [file an issue with PR Preview](${ this.issueUrl(pr) })._```
+        } else {
+            return `_If you don't have enough information above to solve the error by yourself, please [file an issue](${ this.issueUrl(pr) })._`; 
+        } 
+    }
+
     summary(err, pr) {
         let service = this.service(err);
         let link = this.link(err);
         let stack = this.stack(err);
+        let fileIssue = this.fileIssue(err);
         //if (!stack && !link) { return ""; }
         //if (!stack) { return link; }
         return `<details>
@@ -67,14 +81,15 @@ ${ link }
 
 ${ stack }
 
-_If you don't have enough information above to solve the error by yourself (or to understand to which web service the error is related to, if any), please [file an issue](${ this.issueUrl(pr) })._
+${ fileIssue }
+
 </details>`;
     }
 
     issueUrl(pr) {
         var base = "https://github.com/tobie/pr-preview/issues/new";
-        return `${base}?title=Error%20not%20surfaced%20properly&body=See%20${pr.owner}/${pr.repo}%23${pr.number}.`;
+        return `${base}?title=Unidentified%20Error&body=See%20${pr.owner}/${pr.repo}%23${pr.number}.`;
     }
 }
 
-module.exports = ViewError;
+module.exports = ViewError;